So, I've got a theory. She killed her pup not because it upset her by scattering the birds she hunted, but because it embarrassed her in front of the neighbors when it killed their chickens. Cricket wouldn't listen to her and it made her feel publicly ineffectual and weak. Being made to feel that way absolutely enraged her.
She's a massive POS and I really hope this ends her career.
South Louisiana here. It can be used affectionately (seeing a sick child and saying Bless your heart) but I find it is more often used to point out someone's lack of intelligence or bad behaviour (Karen is pitching an absolute fit in the checkout lane at Albertsons because she misread a price label...Bless her heart)
Maybe you're from a more polite area of the south, but where I am we are heavily into calling out morons.